import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1149015 - Part 1: Remove some use of expression closure from jstests ecma_7/. r=sfink (9e6dff3a8)
- Bug 1149015 - Part 2: Remove some use of expression closure from jstests js1_8_5/extensions. r=luke (d80e17569)
- pointer style (dc30e1d39)
- Bug 1079919 - Part 0: Add RegExp ClassSpec. r=bholley (50af5e1dc)
- Bug 1079919 - Part 1: Support RegExp in Xray. r=bholley (d0f45192d)
- Bug 1079919 - Part 2: Make RegExp.prototype.toString to be a generic function. r=Waldo (526f2f611)
- Bug 1079919 - Part 3: Add test for RegExp.prototype properties in webconsole. r=fitzgen (e5d0382d4)
- Bug 1079919 - Part 4: Add Xray test for RegExp.prototype.toString. r=bholley (29abe5b23)
- Bug 1149015 - Part 3: Remove some use of expression closure from jit-test r=luke (393393b8b)
- Bug 1148899 - Rename isExprClosure/setIsExprClosure/EXPR_CLOSURE to isExprBody/setIsExprBody/EXPR_BODY. r=shu (2dc6c47a4)
- Bug 1005110 - Warn about unreachable expression after semicolon-less return. r=efaust (150e54ca0)
- Bug 1054755 - Part 0: Rename existing IsRegExp to IsRegExpObject. r=till (a3980bddf)
- Bug 1054755 - Part 1: Add Symbol.match. r=till (ea12f0adf)
- Bug 1054755 - Part 2: Implement IsRegExp. r=till (440d5f99d)
- Bug 1054755 - Part 3: Use IsRegExp in String.prototype.{contains,startsWith,endsWith}. r=till (ff022ec2b)

js/src/jsarray.cpp

@@ -3294,6 +3294,7 @@ const Class ArrayObject::class_ = {
         GenericCreateConstructor<ArrayConstructor, 1, JSFunction::FinalizeKind>,
         CreateArrayPrototype,
         array_static_methods,
+        nullptr,
         array_methods,
         nullptr,
         array_proto_finish